Vehicle Shudder problems of the 2008 Volkswagen Beetle

In August 2016 I purchased a 2016 Hyundai tucson limited. Since day one, while in traffic the vehicle will begin to shudder until near stall. The shuddering occurs when either rolling forward, accelerating the gas, or sitting idle, as a result my car does not respond to acceleration at all times. During my first month of ownership the dealer did a software update which did not fix the problem. This is becoming increasingly dangerous, my wife's is the primary driver and she is reluctant to drive it for fear that she will be injured in an accident. I have been to the dealership numerous times and get no real answers except that the car checks out fine and they cannot duplicate the issue. They do, however, acknowledge that the problem is a design issue in the transmission. This problem persists no matter what drive mode I am in. I have tried turning off the ac but that has no affect. I had one instance where, while moving from stop to make a left turn in an intersection, the car stumbled and stalled in the intersection and we narrowly missed being hit by the car behind me. We help with transportation for the grandkids and we cannot drive the 10 year old in this car, she gets car sick from the shuddering/hesitation. As a result, we have to substitute another vehicle on the days we drive her.